Substituted 2-aminoalky-1,4-diaminobenzene compounds and oxidation dye precursor compositions containing same

ABSTRACT

The oxidation hair dye precursor composition contains from 0.005 to 20.0 percent by weight of one or more coupler compounds and from 0.005 to 20.0 percent by weight of one or more developer compounds. The one or more developer compounds include at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound of the formula (I):                    
     New substituted 2-aminoalkyl-1,4-diaminobenzene compounds of formula (I) are described.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to compositions for dyeing keratin fibers based on a developer-coupler substance combination, which contain at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound as the developer substance. It also relates to new substituted 2-aminoalkyl-1,4-diaminobenzene compounds.

2. Prior Art

Oxidation dye precursor compounds have been important in the field of dyeing keratin fibers, especially hair, for a long time. The dye compounds for dyeing the keratin fibers are produced by reaction of certain developer substances with certain coupler substances in the presence of a suitable oxidizing agent. The following compounds are examples of developer substances: 2,5-diaminotoluene, 2,5-diaminophenylethyl alcohol, p-aminophenol and 1,4-diaminobenzene. The following compounds are examples of coupler substances: resorcinol, 4-chlororesorcinol, 1-naphthol, 3-aminophenol and derivatives of m-phenylenediamines.

There are numerous additional requirements of oxidation dye precursor compounds for dyeing human hair besides the resulting color in the desired intensity. The dye precursor compounds must be unobjectionable in toxicological and dermatological respects and the resulting hair color of the dyed hair must have good light fastness, permanent wave fastness, acid fastness and rubbing fastness. The color produced by dyeing the hair with the oxidation dye precursor compounds must remain stable in the presence of light, rubbing and chemical agents for at least four to six weeks. Moreover a broad palette of various color shades can be produced by combination of suitable developer and coupler substances.

The requirements for oxidation dye precursor compounds however cannot be completely fulfilled in every way with the currently known dye precursor compounds, as has been stated in the Monograph by K. H.Schrader, “Foundations and Formulations of Cosmetics [Grundlagen und Rezepturen der Kosmetika]”, 2nd Edition, pp. 784-799 (1989). There is therefore a need for new developer substances, which fulfill the above-described requirements to a special extent.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide improved developer compounds for use in a method of dyeing keratin fibers, especially human hair.

It is also an object of the present invention to provide new substituted 2-aminoalkyl-1,4-diaminobenzene compounds for use as developer substances in oxidation dye precursor compositions.

It has now been found surprisingly that certain substituted 2-aminoalkyl-1,4-diaminobenzene compounds of the general formula (I) fulfill the special requirements for developer substances to an especially great extent. When these developer substances are used together with most known coupler substances especially intense colors are produced, which are extraordinarily light-fast and wash-fast.

The new substituted 2-aminoalkyl-1,4-diaminobenzene compounds of the formula (I) according to the invention are:

wherein

R1, R2, R3 and R4, independently of each other, are each hydrogen, a C₁- to C₆-alkyl group, a C₁- to C₄-hydroxyalkyl group, a C₂- to C₄-dihydroxyalkyl group or a C₁- to C₄-alkoxy-(C₁- to C₂)alkyl group, or R1 and R2 or R3 and R4 together with the nitrogen atom form a four member to eight member aliphatic ring, and wherein at least two of the R1, R2, R3 and R4 substituent groups represent hydrogen;

R5 represents hydrogen, a halogen atom, a C₁- to C₄-alkyl group, a C₁- to C₄-hydroxyalkyl group or a C₁- to C₄-alkoxy group;

R6 and R7, independently of each other, each represent hydrogen, a C₁- to C₂-alkoxy group, a C₁- to C₆-alkyl group, a C₁- to C₆-alkenyl group, a C₁- to C₄-hydroxyalkyl group, a C₃- to C₄-dihydroxyalkyl group, a C₁- to C₄-aminoalkyl group, a C₁- to C₄-dimethylaminoalkyl group, a C₁- to C₄-acetylaminoalkyl group, a C₁- to C₄-methoxyalkyl group, a C₁- to C₄-ethoxyalkyl group, a C₁- to C₄-cyanoalkyl group, a C₁- to C₄-carboxyalkyl group, a C₁- to C₄-aminocarbonylalkyl group, a pyridylmethyl group, a furfuryl group, a hydrogenated furfuryl group, a substituted pyridyl group, a group of the formula II:

a group of the formula III:

a group of the formula IV:

wherein at least one of the R6 and R7 groups is not hydrogen, or R6 and R7 together with the nitrogen atom form one of the following rings:

R8 represents hydrogen or a C₁- to C₆-alkyl group;

R9 represents hydrogen, a carboxy group or an aminocarbonyl group;

R10 and R 11, independently of each other, each represent hydrogen, a hydroxy group, an aminocarbonyl group, a methylthiomethyl group, a substituted phenyl group having a phenyl group substituent or a hydroxy group substitutent or a group of the formula:

R12, R13, R14, R15 and R16 are each, independently of each other, hydrogen, a halogen atom, a cyano group, a hydroxy group, a C₁- to C₄-alkoxy group, a C₁- to C₄-hydroxyalkoxy group, a C₁- to C₆-alkyl group, a C₁- to C₄-alkylthioether group, a mercapto group, a nitro group, an amino group, an alkylamino group, a hydroxyalkylamino group, a dialkylamino group, a di(hydroxyalkyl)amino group, a (dihydroxyalkyl)amino group, a (hydroxyalkyl)alkylamino group, a trifluoromethane group, a —C(O)H group, a —C(O)CH₃ group, a —C(O)CF₃ group, a —Si(CH₃)₃ group, a C₁- to C₄-hydroxyalkyl group, a C₃- to C₄-dihydoxyalkyl group, or two of the groups R12 to R16 next to each other form an —O—CH₂—O— bridge;

R17 represents a C₁- to C₄-alkyl group or a a C₁- to C₄-hydroxyalkyl group; R18 represents hydrogen or a C₁- to C₆-alkyl group;

R19 represents one or more hydrogen, or hydroxy-, carboxy-, aminocarbonyl-, or hydroxymethyl group; and

R20 represents hydrogen or a C₁- to C₆-alkyl group, with the proviso that R₁, R2 and R8 are not each hydrogen when (i) R3 and R4 are a C₁- to C₄-alkyl group or

R3 and R4 together with the nitrogen atom form a morpholino-, pyrrolidino-, piperidino- or hexamethylenimino ring, and when (ii) R5 is in the 5-position of the aromatic ring and R5 is hydrogen, a C₁- to C₄-alkyl group or a halogen atom, and

when (iii) R6 and R7, independently of each other, are a C₁- to C₄-alkyl group or a phenyl group or R3 and R4 taken together with the nitrogen atom form an unsubstituted piperidino- or pyrrolidino- ring;

or a physiologically compatible, water-soluble salt thereof.

The following are examples of the compounds of formula (I):

2-(2,3-dihydroxypropyl)aminomethyl-1,4-diaminobenzene; 2-ethylaminomethyl-1,4-diaminobenzene; 2-(isopropylaminomethyl)-1,4-diaminobenzene; 2-propylaminomethyl-1,4-diaminobenzene; 2-pyrrolidin-1-yl-methyl-1,4-diaminobenzene; 2-[(2-methoxyethylamino)methyl]-1,4-diaminobenzene; 2-morpholin-4-yl-methyl-1,4-diaminobenzene; 2-(2,5-diaminobenzylamino)-butan-1-ol; 2-{[(furan-2-ylmethyl)amino]methyl)-1,4-diaminobenzene; N-(2,5-diaminobenzyl)-O,N-dimethylhydroxylamine; 2-(4-methylpiperazin-1-yl-methyl)-1,4-diaminobenzene; 1-(2,5-diaminobenzyl)piperidin-4-ol; N-[2-(2,5-diaminobenzylamino)ethyl]acetamide; 2-[(2-morpholin-4-yl-ethylamino)methyl]-1,4-diaminobenzene; 2-allylaminomethyl-1,4-diaminobenzene; 2-(2,5-diaminobenzylamino)propan-1-ol; 2-[(3-imidazol-1-yl-propylamino)-methyl]-1,4-diaminobenzene; 2-{[(tetrahydrofuran-2-yl-methyl)amino]methyl}-1,4-diaminobenzene; 4-(2,5-diaminobenzylamino)aniline; 3-(2,5-diaminobenzylamino)phenol; 5-(2,5-diaminobenzylamino)-2-methylphenol; 2-[(2-dimethylaminoethylamino)-methyl]-1,4-diaminobenzene; 4-(2,5-diaminobenzylamino)butan-1-ol; 2-[(3-ethoxypropylamino)methyl]-1,4-diaminobenzene; 2-[(3-methoxy-phenylamino)-methyl]-1,4-diaminobenzene; 2-[(4-chlorophenylamino)methyl]-1,4-diaminobenzene; 2-[(cyclopropyl-methylamino)methyl]-1,4-diaminobenzene; 2-(2,5-diaminobenzylamino)-4-nitrophenol; 2-[(4-chlorobenzylamino)methyl]-1,4-diaminobenzene; 2-[(2,5-diaminobenzyl)methylamino]-ethanol; 2-[(2,5-diamino-benzyl)ethylamino]ethanol; 2{[(pyridin-4-yl-methyl)amino]methyl}-1,4-diaminobenzene; 1-[3-(2,5-diaminobenzylamino)-propyl]pyrrolidin-2-one; 2-(4-amino-2-methylphenyl)aminomethyl-1,4-diaminobenzene; 2-(4-amino-3-methylphenyl)aminomethyl-1,4-diaminobenzene; 2-[5-amino-2-(2,5-diamino-benzylamino)phenyl]ethanol; 2-(3-amino-phenyl)aminomethyl-1,4-diaminobenzene; 4-[2-(2,5-diaminobenzylamino)-ethyl]benzenesulfonamide; 2-[4-amino-2-(2,5-diaminobenzylamino)-phenoxy]ethanol; 2-[(2,5-diaminobenzyl)-(2-hydroxy-ethyl)amino]ethanol; [1-(2,5-diaminobenzyl)pyrrolidin-2-yl]-methanol; 1-(2,5-diaminobenzyl)pyrrolidin-3-ol; 1-(2,5-diaminobenzyl)-pyrrolidin-2-carboxylic acid amide; 1-(2,5-diaminobenzyl)-piperidin-3-ol; 2-(2,5-diamino-benzylamino)-propan-1,3-diol; 2-(2,5-diaminobenzylamino)-3-hydroxypropionamide; 2-(2,5-diaminobenzylamino)succinic acid; 2-cyclopropylaminomethyl-1,4-diaminobenzene; 2-(2,5-diaminobenzylamino)ethanol; (2,5-diaminobenzylamino)acetic acid; 4-(2,5-diaminobenzylamino)phenol; 2-(benzo[1,3]dioxol-5-yl-aminomethyl)-1,4-diaminobenzene; [(2,5-diaminobenzyl)-methyl-amino]acetonitrile; 2-pentyl-aminomethyl -1,4-diaminobenzene; 2-[(3-dimethylaminopropylamino)-methyl]-1,4-diaminobenzene; 2-{[2-(5-nitropyridin-2-yl-amino)ethylamino]-methyl}-1,4-diaminobenzene; 2-[(2-aminoethyl-amino)methyl]-1,4-diaminobenzene; 3-[2-(2,5-diaminobenzylamino)-1-hydroxyethyl]phenol; 2-[(4-methyl-pyridin-2-yl-amino)methyl]-1,4-diaminobenzene; 2-(2,5-diaminobenzyl)-1-methyl-1,2,3,4-tetrahydroisoquinolin-6,7-diol; 2-(2,5-diamino-benzylamino)-4-methylsulfanyl-butyric acid; 1-(2,5-diaminobenzyl)-pyrrolidin-2-carboxylic acid; 2-phenylamino-methyl -1,4-diaminobenzene; 2-(4-dimethylamino-phenylaminomethyl-1,4-diaminobenzene; 1-[3-(2,5-diaminobenzylamino)phenyl]ethanol; 1-[4-(2,5-diaminobenzylamino)-phenyl]ethanol; 1-[2-(2,5-diaminobenzylamino)-phenyl]ethanol; 2-[(3,4-dimethoxyphenylamino)methyl]-1,4-diaminobenzene; 2-[(3-fluoro-2-methoxyphenylamino)-methyl]-1,4-diaminobenzene; 4-chloro-2-(2,5-diaminobenzylamino)-phenol; 2-[(4-trifluoromethyl-phenylamino)-methyl]-1,4-diamino-benzene; 2-(p-tolylaminomethyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-(di(hydroxyethyl)aminomethyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-(hydroxyethylaminomethyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-(methylaminomethyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-(di(hydroxyethyl)aminomethyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-(hydroxyethylaminomethyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-(methylaminomethyl)-1,4-diaminobenzene; N⁴,N⁴-bis-(hydroxyethyl)-2-(di(hydroxyethyl)aminomethyl)-1,4-diaminobenzene; N⁴,N⁴-bis-(hydroxyethyl)-2-(hydroxyethylaminomethyl)-1,4-diaminobenzene; N⁴, N⁴-bis-(hydroxyethyl)-2-(methylaminomethyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-(di(hydroxyethyl)-aminomethyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-(hydroxyethyl-aminomethyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-(methylaminomethyl)-1,4-diaminobenzene; N¹-dihydroxyethyl-2-di(hydroxyethyl)aminomethyl)-1,4-diaminobenzene; N¹-hydroxyethyl-2-(hydroxyethylaminomethyl)-1,4-diaminobenzene; N¹-hydroxyethyl-2-(hydroxyethylaminomethyl)-1,4-diaminobenzene; N¹,N¹-bis-(hydroxyethyl)-2-(di(hydroxyethyl)aminomethyl)-1,4-diaminobenzene; N¹N,N¹-bis-(hydroxyethyl)-2-(hydroxyethylaminomethyl)-1,4-diaminobenzene; N¹,N¹-bis(hydroxyethyl)-2-(methylaminomethyl)-1,4-diaminobenzene; 2-((2-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-((2-dimethylaminophenylamino)-methyl)-1,4-diaminobenzene; 2-((2-methylphenylamino)methyl)-1,4-diamino-benzene;2-((2-trifluoromethylphenylamino)methyl)-1,4-diaminobenzene; 2-((3-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-methylphenylamino)methyl)-1,4-diaminobenzene; 2-((3-trifluoromethylphenylamino)-methyl)-1,4-diaminobenzene; 2-((2-bromophenylamino)methyl)-1,4-diaminobenzene; 2-((2-cyanophenylamino)methyl)-1,4-diaminobenzene; 2-((2-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((2-methoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((2-nitrophenylamino)methyl)-1,4-diaminobenzene; 2-((3-bromophenylamino)methyl)-1,4-diaminobenzene; 2-((3-cyanophenylamino)methyl)-1,4-diaminobenzene; 2-((3-fluorophenylamino)-methyl)-1,4-diaminobenzene; 2-((3-methoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((3-nitrophenylamino)methyl)-1,4-diaminobenzene; 2-((4-bromophenylamino)-methyl)-1,4-diaminobenzene; 2-((4-cyanophenylamino)-methyl)-1,4-diaminobenzene; 2-((4-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((4-methoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((4-nitrophenylamino)methyl)-1,4-diaminobenzene; 2-((2-(1,3-dihydroxypropyl)aminophenylamino)-methyl)-1,4-diaminobenzene; 2-((2-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-pyrrolidin-phenylamino)methyl)-1,4-diaminobenzene; 2-((3-( 1,3-dihydroxypropyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-pyrrolidin-phenylamino)methyl)-1,4-diaminobenzene; 2-((4-(1,3-dihydroxypropyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-pyrrolidin-phenylamino)methyl)-1,4-diaminobenzene; 2-((4-amino-2-(2-hydroxyethoxy)-phenylamino)methyl)-1,4-diaminobenzene; 2-((4-amino-2-chlorophenylamino)-methyl)-1,4-diaminobenzene; 2-((4-amino-2-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-((4-amino-2-methoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((4-amino-3-(2-hydroxyethoxy)phenylamino)-methyl)-1,4-diaminobenzene; 2-((4-amino-3-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((4-amino-3-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-((4-amino-3-methoxyphenylamino)-methyl)-1,4-diaminobenzene; 2-((3,4-diamino-phenylamino)methyl)-1,4-diaminobenzene; 2-((2,4-diaminophenylamino)methyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-((4-aminophenylamino)methyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-(phenylaminomethyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-((4-di(hydroxyethyl)aminophenylamino)-methyl)-1,4-diaminobenzene; N⁴-dihydroxypropyl-2-((4-hydroxyethylaminophenylamino)-methyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-((4-aminophenylamino)methyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-(phenylaminomethyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-((4-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; N⁴-hydroxyethyl-2-((4-hydroxyethylaminophenylamino)-methyl)-1,4-diaminobenzene; N⁴,N⁴-bis-(hydroxyethyl)-2-(4-aminophenylamino)-methyl)-1,4-diaminobenzene; N⁴,N⁴-bis-(hydroxyethyl)-2-phenylaminomethyl)-1,4-diaminobenzene; N⁴,N⁴-bis-(hydroxyethyl)-2-(4-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; N⁴,N⁴-bis-(hydroxyethyl)-2-(4-hydroxyethylamino-phenylamino)methyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-((4-amino-phenylamino)methyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-(phenylaminomethyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-((4-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; N¹-dihydroxypropyl-2-((4-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; N¹-hydroxyethyl-2-((4-aminophenylamino)methyl)-1,4-diaminobenzene; N¹-hydroxyethyl-2-(phenylaminomethyl)-1,4-diaminobenzene; N¹-hydroxyethyl-2-((4-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; N¹-hydroxyethyl-2-((4-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; N¹, N¹-bis-(hydroxyethyl)-2-(4-aminophenylamino)methyl)-1,4-diaminobenzene; N¹, N¹-bis-(hydroxyethyl)-2-phenylaminomethyl)-1,4-diaminobenzene; N¹,N¹-bis-(hydroxyethyl)-2-(4-di(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; N¹,N¹-bis-(hydroxyethyl)-2-(4-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-[5-amino-4-(2,5-diaminophenylamino)-pyrazol-1-yl]ethanol; N²-(5-amino-1-methyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene; N²-(5-amino-1-isopropyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene and N²-(5-amino-1,3-dimethyl-1H-pyrazol4-yl)-1,2,4-triaminobenzene.

The preferred compounds of formula (I) are those compounds, in which (i) one or more groups R5 and R8 are hydrogen and/or (ii) R1, R2, R3 and R4 simultaneously represent hydrogen and/or (iii) R6 represents a methyl group or a C₁-C₄-hydroxyalkyl group and R7 represents a C₁-C₄-hydroxyalkyl group and/or (iv) R6 represents hydrogen and R7 represents a C₁-C₄-hydroxyalkyl group, a substituted pyridyl group, a substituted phenyl group, a substituted pyrazoyl group or a group of the following formula:

and/or (v) R6 and R7 represent an aliphatic ring of the formula:

Particularly the following compounds are preferred examples of the compounds of formula (I): 2-(2,3-dihydroxypropyl)aminomethyl-1,4-diaminobenzene; 2-[(2-aminoethylamino)methyl]-1,4-diaminobenzene; 2-[(2-hydroxyethylamino)methyl]-1,4-diaminobenzene; 2-[(2,5-diaminobenzyl)methylamino]-ethanol; 2-(2,5-diaminobenzylamino)-propan-1-ol; 2-[(2,5-diaminobenzyl)-(2-hydroxyethyl)amino]ethanol; [1-(2,5-diaminobenzyl)pyrrolidin-2-yl]methanol; 1-(2,5-diaminobenzyl)-pyrrolidin-2-carbamide; 2-[(4-methylpyridin-2-yl-amino)methyl]-1,4-diaminobenzene; 2-((2-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((2-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-N,N-bis-(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-pyrrolidinphenylamino)methyl)-1,4-diaminobenzene; 2-((3-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((3-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-N,N-bis-(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-pyrrolidin-phenylamino)methyl)-1,4-diaminobenzene;2-((4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((4-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((4-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-N,N-bis-(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-pyrrolidinphenylamino)methyl)-1,4-diaminobenzene; 2-((2-(2-hydroxy)-ethoxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-amino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-chloro-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyethylamino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-methyl-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-(2-hydroxy)-ethoxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-amino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-chloro-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyethylamino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-methyl-4-aminophenylamino)-methyl)-1,4-diaminobenzene; 2-((2-(2-hydroxy)ethoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-((3-(2-hydroxy)ethoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyphenylamino)-methyl)-1,4-diaminobenzene; 2-((4-(2-hydroxy)-ethoxy-phenylamino)methyl)-1,4-diaminobenzene; 2-((4-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-(phenylamino)methyl-1,4-diaminobenzene; 2-[5-amino-4-(2,5-diaminophenylamino)-pyrazol-1-yl]ethanol; N²-(5-amino-1-methyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene; N²-(5-amino-1-isopropyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene and N²-(5-amino-1,3-dimethyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene.

The compounds of formula I can be employed both as free bases and also in the form of their physiologically compatible salts with inorganic or organic acids, such as hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, propionic acid, lactic acid or citric acid.

The method of making the substituted diaminobenzene derivatives according to formula (I) can occur using known synthetic methods. The synthesis of the compounds according to the invention, for example, can occur by the following methods: Either (a) by performing a reductive amination of a substituted benzene of formula (V)

in which Ra has the significance of a protective group, for example as described in the chapter, “Protective Groups” in Organic Synthesis, Chapter 7, Wiley Interscience, 1991; Rb represents NR1Ra or NR1R2; by reacting the compound of formula (V) with an amine of formula HNR6R7, wherein R1, R2, R5, R6, R7 and R8 have the same significance as in formula (I) above and subsequently splitting off the protective group; or

(b) by substitution of a substituted benzene of formula (VI)

with an amine of formula HNR1R2, reduction of the nitrile group, subsequent alkylation of the amino group with a compound of formula XR6 and/or XR7, and finally reduction of the nitro group, wherein R1, R2, R5, R6 and R7 have the same significance as in the above formula (I) and X represents a halogen atom.

The substituted 2-aminoalkyl-1,4-diaminobenzene compounds according to formula (I) are soluble in water and produce colors with a higher intensity and better fastness, especially light-fastness, wash-fastness and rubbing-fastness, than prior art developer compounds. The substituted 2-aminoalkyl-1,4-diaminobenzene compounds according to formula (I) have outstanding storage stability, especially as components of a subsequently described oxidation dye precursor composition.

The subject matter of the present invention also includes a composition for oxidative dyeing of keratin fibers, for example hairs, fur, fibers or wool, especially human hair, comprising a combination of coupler substance and developer substances, which contain at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound of formula (I).

The at least one 2-aminoalkyl-1,4-diaminobenzene derivative compound of formula (I) is present in the oxidation dye precursor composition according to the invention in an amount of about 0.005 to 20 percent by weight, however an amount of about 0.01 to 8.0 percent by weight is preferred and 0.1 to 5.0 percent by weight is particularly preferred.

The coupler substance preferably can be 2,6-diamino-pyridine, 2-amino-4-[(2-hydroxyethyl)amino]anisole, 2,4-diamino-1-fluoro-5-methylbenzene, 2,4-diamino-1-methoxy-5-methylbenzene, 2,4-diamino-1-ethoxy-5-methylbenzene, 2,4-diamino-1-(2-hydroxyethoxy)-5-methylbenzene, 2,4-di[(2-hydroxyethyl)-amino]-1,5-dimethoxybenzene, 2,3-diamino-6-methoxypyridine, 3-amino-6-methoxy-2-(methylamino)pyridine, 2,6-diamino-3,5-dimethoxypyridine, 3,5-diamino-2,6-dimethoxypyridine, 1,3-diaminobenzene, 2,4-diamino-1-(2-hydroxyethoxy)benzene, 2,4-diamino-1,5-di(2-hydroxyethoxy)-benzene, 1-(2-aminoethoxy)-2,4-diaminobenzene, 2-amino-1-(2-hydroxyethoxy)-4-methylaminobenzene, 2,4-diaminophenoxyacetic acid, 3-[(di(2-hydroxyethyl)-amino]-aniline, 4-amino-2-di[(2-hydroxyethyl)amino]-1-ethoxybenzene, 5-methyl-2-(1-methylethyl)phenol, 3-[(2-hydroxyethyl)amino]aniline, 3-[(2-amino-ethyl)-amino]aniline, 1,3-di(2,4-diaminophenoxy)propane, di(2,4-diaminophenoxy)-methane, 1,3-diamino-2,4-dimethoxy-benzene, 2,6-bis(2-hydroxyethyl)aminotoluene, 4-hydroxyindole, 3-dimethylaminophenol, 3-diethylaminophenol, 5-amino-2-methylphenol, 5-amino-4-fluoro-2-methylphenol, 5-amino4-methoxy-2-methylphenol, 5-amino-4-ethoxy-2-methylphenol, 3-amino-2,4-dicholorophenol, 5-amino-2,4-dichlorophenol, 3-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 3-aminophenol, 2-{(3-hydroxyphenyl)amino]-acetamide, 5-[(2-hydroxyethyl)amino]-2-methylphenol, 3-[(2-hydroxyethyl)-aminophenol, 3-[(2-methoxyethyl)amino]phenol, 5-amino-2-ethylphenol, 2-(4-amino-2-hydroxyphenoxy)ethanol, 5-[(3-hydroxypropyl)amino]-2-methylphenol, 3-[(2,3-dihydroxypropyl)amino]-2-methylphenol, 3-[(2-hydroxyethyl)amino]-2-methyl-phenol, 2-amino-3-hydroxypyridine, 5-amino-4-chloro-2-methyl-phenol, 1-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxy-naphthalene, 2,3-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 2-methyl-1-naphthol acetate, 1,3-dihydoxybenzene, 1-chloro-2,4-dihydroxybenzene, 2-chloro-1,3-dihydroxybenzene, 1,2-dichloro-3,5-dihydroxy-4-methylbenzene, 1,5-dichloro-2,4-dihydroxy-benzene, 1,3-dihydroxy-2-methylbenzene, 3,4-methylenedioxyphenol, 3,4-methylenedioxyaniline, 5-[(2-hydroxy-ethyl)amino]-1,3-benzodioxole, 6-bromo-1-hydroxy-3,4-methylenedioxybenzene, 3,4-diaminobenzoic acid, 3,4-dihydro-6-hydroxy-1,4(2H)-benzoxazine, 6-amino-3,4-dihydro-1,4(2H)-benzoxazine, 3-methyl-1-phenyl-5-pyrazolone, 5,6-dihydroxy-indole, 5,6-dihydroxyindoline, 5-hydroxyindole, 6-hydroxy-indole, 7-hydroxyindole and 2,3-indolindione.

Although the advantageous properties of the above-described substituted 2-aminoalkyl-1,4-diaminobenzene compounds of formula (I) can obviously be obtained when the diaminobenzene derivative compounds of formula (I) are used alone, it is understandably also possible to use the 2-aminoalkyl-1,4-diaminobenzene compounds of formula (I) together with known developer substances, such as 1,4-diaminobenzene, 2,5-diaminotoluene, 2,5-diaminophenyl-ethyl alcohol, 4-aminophenol and its derivatives, especially 4-amino-3-methylphenol, 4,5-diamino-1-(2-hydroxyethyl)pyrazole or tetraaminopyrimidines.

The coupler and developer substances can be contained in the oxidation dye precursor compositions according to the invention individually, or in mixtures with each other. The coupler substances and developer substances are contained in the dye precursor composition according to the invention (relative to the total amount of the dye precursor composition) in an amount of from about 0.005 to 20 percent by weight respectively. However an amount of from about 0.01 to 5.0 percent by weight is preferable and from 0.1 to 2.5 percent by weight is especially preferably.

The total amount of the combination of developer and coupler substances in the oxidation dye precursor composition described here is preferably from about 0.01 to 20 percent by weight, especially preferably from about 0.02 to 10 percent by weight, and most preferably from 0.2 to 6.0 percent by weight. The developer and coupler substances are used generally in equimolar amounts, however it is not disadvantageous when the developer substances are present in a certain excess or deficiency.

The dye compositions according to the invention can also contain certain other dye ingredients, for example 6-amino-2-methylphenol and 2-amino-5-methylphenol, as well as conventional direct-dyeing dye compounds, such as triphenylmethane dye compounds, such as 4-[(4′-aminophenyl)-(4′-imino-2″,5″-cyclohexadien-1″-yliden)-methyl]-2-methylaminobenzene monohydrochloride (C.I. 42 510) and 4-[(4′-amino-3′-methylphenyl)-(4″-imino-2″,5″-cyclohexadien-1″-yliden)methyl]-2-methylaminobenzene monohydrochloride (C.I. 42 520); aromatic nitro dye compounds, such as 4-(2′-hydroxyethyl)aminonitrotoluene, 2-amino-4,6-dinitrophenol, 2-amino-5-(2′-hydroxyethyl)aminonitrobenzene, 2-chloro-6-(ethylamino)-4-nitrophenol, 4-chloro-N-(2-hydroxyethyl)-2-nitroaniline, 5-chloro-2-hydroxy-4-nitroaniline, 2-amino-4-chloro-6-nitro-phenol and 1-[(2′-ureidoethyl)amino-4-nitrobenzene; azo dye compounds, such as 6-[(4′-aminophenyl)azo]-5-hydroxy-napththalen-1-sulfonic acid sodium salt (C.I. 14 805) and dispersion dye compounds, such as 1,4-diaminoanthraquinone and 1,4,5,8-tetraaminoanthraquinone. These additional dye compounds can be contained in the oxidation dye precurosr composition of the invention in an amount of from about 0.1 to 4.0 percent by weight.

Understandably the coupler substances and the developer substances as well as the other dye compounds, in so far as they are bases, can also be used in the form of their physiologically compatible salts with organic or inorganic acids, such as hydrochloric acid or sulfuric acid, or, in so far as they have aromatic OH groups, in the form of their salts with bases, such as alkali phenolates.

Moreover cosmetic additive ingredients, which are commonly used in compositions for dyeing hair, can be used in the oxidation dye precursor compositions according to the invention, for example antioxidants, such as ascorbic acid, thioglycolic acid or sodium sulfite, and perfume oils, complex formers, wetting agents, emulsifiers, thickeners and care materials. The form of the dye compositions according to the invention can be, for example, a solution, especially an aqueous or aqueous-alcoholic solution. However the form that is particularly preferred is a cream, gel or an emulsion. Its composition is a mixture of the dye ingredients with the conventional cosmetic additive ingredients suitable for the particular preparation.

Conventional cosmetic additive ingredients in solutions, creams, emulsion or gels include, for example, solvents, such as water, lower aliphatic alcohols, such as ethanol, propanol or isopropanol, glycerol or glycols, such as 1,2-propylene glycol, wetting agents or emulsifiers from the classes of anionic, cationic, amphoteric or nonionic surfactant compounds, such as fatty alcohol sulfates, ethoxylated fatty alcohol sulfates, alkylsulfonates, alkylbenzenesulfonates, alkyltrimethylammonium salts, aklylbetaines, ethoxylated fatty alcohols, ethoxylated nonylphenols, fatty acid alkanol amides and ethoxylated fatty acid esters; thickeners, such as higher fatty alcohols, starches, cellulose derivatives, petrolatum, paraffin oil and fatty acids, as well as care materials, such as cationic resins, lanolin derivatives, cholesterol, pantothenic acids and betaine. The above-mentioned conventional cosmetic ingredients are used in amounts suitable for their purposes. For example the wetting agents and emulsifiers are used in concentrations of from about 0.5 to 30 percent by weight, the thickeners are used in an amount of from about 0.1 to 25 percent by weight and the care materials are used in concentrations of from about 0.1 to 5.0 percent by weight.

The oxidation dye precursor compositions according to the invention can be weakly acidic, neutral or alkaline according to their composition. These compositions preferably have pH values of from 6.8 to 11.5. Their pH can be adjusted in the basic range with ammonia. Also organic amines can be used for this purpose, including monoethanolamine and triethanolamine, or also inorganic bases, such as sodium hydroxide and potassium hydroxide. Inorganic or organic acids can be used for adjusting the pH in the acid range, for example phosphoric acid, acetic acid, citric acid or tartaric acid.

In order to use the oxidation hair dye precursor composition for dyeing hair one mixes the above-described compositions according to the invention with an oxidizing agent immediately prior to use and applies a sufficient amount of the ready-to-apply mixture to the hair, according to the hair abundance, generally from about 60 to 200 grams.

Principally hydrogen peroxide, or its addition compounds with urea, melamine, sodium borate or sodium carbonate, can be used in the form of a 3 to 12 percent, preferably 6 percent, aqueous solution as the oxidizing agent for developing the hair dye. Air oxygen can also be used as the oxidizing agent. If a 6 percent hydrogen peroxide solution is used as oxidizing agent, the weight ratio of hair dye composition and oxidizing agent is 5:1 to 1:2, but preferably 1:1. Larger amounts of oxidizing agent are used above all with larger dye concentrations in the oxidation dye precursor composition, or when at the same time a strong bleaching of the hair is desired. The mixture of the oxidizing agent and the oxidation dye precursor composition of the invention is allowed to act on the hair for about 10 to 45 minutes, preferably 30 minutes, at 15 to 65 degrees Celsius, the hair is rinsed with water and dried. If necessary it is washed with a shampoo and eventually after-rinsed with a weak organic acid, such as citric acid or tartaric acid. Subsequently the hair is dried.

The oxidation hair dye precursor compositions according to the invention with a content of the substituted 2-aminoalkyl-1,4-diaminobenzene compounds of formula (I) as developer substances permit hair dyeing with outstanding color fastness, especially light fastness, fastness to washing and fastness to rubbing. The dye precursor compositions according to the invention provide a broad palette of different color shades, which extend from blond to brown, purple, violet to blue and black shades, according to the type and composition of the dye compounds in it. Particularly the color shades produced have outstanding color intensity. The very good dyeing properties of the compositions according to the invention include the production of good color coverage and dyeing of gray, chemically not-previously damaged hair without problems.

The following examples should serve to illustrate the invention, but details present in these examples should not be considered as further limiting the following appended claims, unless they are explicitly included in the following appended claims.

EXAMPLES Example 1 Synthesis of 2-(aminomethyl)-1,4-diaminobenzene Compounds (General Synthetic Recipe)

A. Synthesis of 2,5-bis.-tert.-butyloxycarbonylaminobromobenzene

15.65 g (0.07 mol)bromo-p-phenylenediamine hydrochloride and 32.7 g (0.15 mol)di-tert.-butyl-dicarbonate are dissolved in a mixture of 250 ml 2N sodium hydroxide and 250 ml trifluorotoluene and heated at 45° C. This reaction mixture is stirred for 3 days. Then 30 g (0.14 mol) di-tert.-butyl dicarbonate are gradually added. Subsequently the organic layer is separated and the aqueous phase is extracted twice with 100 ml dichloromethane. The combined extracts are evaporated to dryness and the residue is taken up in 200 ml of hexane. The precipitate is filtered and washed with 50 ml hexane. 18.6 g (82% of theoretical) of 2,5-bis-tert.-butyloxycarbonylaminobromobenzene is obtained with a melting point of 130° C.

B. Synthesis of N-(4-tert.-butyloxycarbonylamino-2-formylphenyl)carbamic acid-tert. butylester

3.3 g (0.01 mol) 2,5-bis-tert.-butyloxycarbonylaminobromobenzene from step A are dissolved in 100 ml of water-free tetrahydrofuran under argon. 17 ml of a 1.6 molar etheric methyl lithium solution (0.03 mol) are gradually added. The reaction mixture is cooled to −20° C., 7 ml of a 1.5 molar tert.-butyl lithium solution (0.01 mol) are gradually added. After the addition has ended the solution is stirred for 30 minutes at the given temperature. Subsequently 1.2 g of dimethyl formamide (0.02 mol) are added and the reaction mixture is stirred for one hour at −20° C. After slowly heating to room temperature the reaction mixture is hydrolyzed with water and then poured into ether, the aqueous phase is extracted with ether and then the organic phase is dried over magnesium sulfate. The solvent is distilled away in a rotary evaporator and the residue is purified on silica gel with a petroleum ether/ethyl acetate solvent (9/1).

C. Synthesis of Substituted 2-aminomethyl-1,4-diaminobenzene Compounds

0.033 g (0.0001 mol) N-(4-tert.-butyloxycarbonylamino-2-formylphenyl)-carbamic acid-tert.-butyl ester from step B and 0.00015 mol of the corresponding amines are dissolved in 1,2-dichloroethane. Subsequently 0.1 ml of an acetic acid solution (1M in 1,2-dichloroethane) and 0.06 g NaBH(OAc)₃(0.0003 mol) are added and the reaction mixture is stirred from 5 to 15 hours at room temperature.

After ending the reaction the reaction mixture is poured into 10 ml of ethyl acetate, the organic phase is extracted with sodium hydrogen carbonate and then dried with magnesium sulfate. The solvent is distilled off in a rotary evaporator and the residue is purified with petroleum ether/ethyl acetate (9:1). The product thus obtained is heated in 4 ml ethanol at 50° C.

Subsequently 1.5 ml of a 2.9 molar ethanolic hydrochloric acid solution are added drop-wise. The precipitate is filtered off, washed twice with 1 ml ethanol and then dried.

a1. 2-ethylamino-1,4-diaminobenzene hydrochloride

Amine Used: ethylamine

Yield: 0.025 g (91% of theory)

Mass Spectrum MH⁺ 166(100)

b1. 2-(isopropylaminomethyl)-1,4-diaminobenzene hydrochloride

Amine Used: isopropylamine

Yield: 0.017 g (59% of theory)

Mass Spectrum MH⁺ 180(100)

c1. 2-propylaminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: propylamine

Yield: 0.025 g (87% of theory)

Mass Spectrum MH⁺ 180(100)

d1. 2-pyrrolidin-1-ylmethyl-1,4-diaminobenzene hydrochloride

Amine Used: pyrrolidine

Yield: 0.025 g (83% of theory)

Mass Spectrum MH⁺ 192(100)

e1. 2-[(2-methoxyethylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 2-methoxyethylamine

Yield: 0.025 g (82% of theory)

Mass Spectrum MH⁺ 196(100)

f1. 2-morpholin-4-ylmethyl-1,4-diaminobenzene hydrochloride

Amine Used: morpholine

Yield: 0.0259 (79% of theory)

Mass Spectrum MH⁺ 208(100)

g1. 2-(2,5-diaminobenzylamino)butan-1-ol hydrochloride

Amine Used: 2-amino-1-butanol

Yield: 0.025 g (78% of theory)

Mass Spectrum MH⁺ 210(100)

h1. 2-{[(furan-2-ylmethyl)amino]methyl}-1,4-diaminobenzene hydrochloride

Amine Used: furfurylamine

Yield: 0.025 g (76% of theory)

Mass Spectrum MH⁺ 218(100)

i1. N-(2,5-diaminobenzyl)-O,N-dimethylhydroxylamine hydrochloride

Amine Used: O, N-dimethylhydroxylamine

Yield: 0.025 g (86% of theory)

Mass Spectrum MH⁺ 182(100)

j1. 2-(4-methylpiperazin-1-ylmethyl)-1,4-diaminobenzene hydrochloride

Amine Used: 4-methylpiperazine

Yield: 0.025 g (68% of theory)

Mass Spectrum MH⁺ 221 (100)

k1. 1-(2,5-diaminobenzyl)piperidin-4-ol hydrochloride

Amine Used: 4-hydroxypiperidine

Yield: 0.025 g (76% of theory)

Mass Spectrum MH⁺ 222(100)

l1. N-[2-(2,5-diaminobenzylamino)ethyl]acetamide hydrochloride N-acetylethylenediamine

Amine Used: ethylamine

Yield: 0.025 g (75% of theory)

Mass Spectrum MH⁺ 223(100)

m1. 2-[(2-morpholin-4-yl-ethylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 4-(2-ethylamino)morpholine

Yield: 0.025 g (63% of theory)

Mass Spectrum MH⁺ 251 (100)

n1. 2-allylaminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: allylamine

Yield: 0.025 g (87% of theory)

Mass Spectrum MH⁺ 178(100)

o1. 2-(2,5-diaminobenzylamino)propan-1-ol hydrochloride

Amine Used: 2-aminopropanol

Yield: 0.025 g (82% of theory)

Mass Spectrum MH⁺ 196(100)

p1. 2-[(3-imidazol-1-ylpropylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 1-(3-aminopropyl)imidazole

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 246(100)

q1. 2-{[(tetrahydrofuran-2-ylmethyl)amino]methyl}-1,4-diaminobenzene hydrochloride

Amine Used: tetrahydrofurfurylamine

Yield: 0.025 g (76% of theory)

Mass Spectrum MH⁺ 222(100)

r1. 4-(2,5-diaminobenzylamino)aniline hydrochloride

Amine Used: 4-tert.-butyloxycarbonylaminoaniline

Yield: 0.025 g (67% of theory)

Mass Spectrum MH⁺ 229(100)

s1. 3-(2,5-diaminobenzylamino)phenol hydrochloride

Amine Used: 3-aminophenol

Yield: 0.025 g (74% of theory)

Mass Spectrum MH⁺ 230(100)

t1. 5-(2,5-diaminobenzylamino)-2-methylphenol hydrochloride

Amine Used: 3-amino-6-methylphenol

Yield: 0.025 g (71% of theory)

Mass Spectrum MH⁺ 244(100)

u1. 2-[(2-dimethylaminoethylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 2-dimethylaminoethylamine

Yield: 0.016 g (45% of theory)

Mass Spectrum MH⁺ 209(100)

v1. 4-(2,5-diaminobenzylamino)butan-1-ol hydrochloride

Amine Used: 4-aminobutanol

Yield: 0.022 g (69% of theory)

Mass Spectrum MH⁺ 210(100)

w1. 2-[(3-ethoxypropylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 3-ethoxypropylamine

Yield: 0.025 g (75% of theory)

Mass Spectrum MH⁺ 224(100)

x1. 2-[(3-methoxyphenylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 3-methoxyaniline

Yield: 0.025 g (71% of theory)

Mass Spectrum MH⁺ 244(100)

y1. 2-[(4-chlorophenylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 4-chloroaniline

Yield: 0.025 g (70% of theory)

Mass Spectrum MH⁺ 248(100)

z1. 2-[(cyclopropylmethylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: aminomethylcyclopropane

Yield: 0.01 7 g (56% of theory)

Mass Spectrum MH⁺ 192(100)

a2. 2-(2 5-diaminobenzylamino)-4-nitrophenol hydrochloride

Amine Used: 2-amino-4-nitrophenol

Yield: 0.025 g (65% of theory)

Mass Spectrum MH⁺ 275(100)

b2. 2-[(4-chlorobenzylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 4-chlorobenzylamine

Yield: 0.025 g (67% of theory)

Mass Spectrum MH⁺ 262(100)

c2. 2-[(2,5-diaminobenzyl)methylamino]ethanol hydrochloride

Amine Used: 2-methylaminoethanol

Yield: 0.025 g (82% of theory)

Mass Spectrum MH⁺ 196(100)

d2. 2-[(2,5-diaminobenzyl)ethylamino]ethanol hydrochloride

Amine Used: 2-ethylaminoethanol

Yield: 0.025 g (78% of theory)

Mass Spectrum MH⁺ 210(100)

e2. 2-{[(pyridin-4-ylmethyl)amino]methyl}-1,4-diaminobenzene hydrochloride

Amine Used: 4-picolylamine

Yield: 0.025 g (67% of theory)

Mass Spectrum MH⁺ 229(100)

f2. 1-[3-(2,5-diaminobenzylamino)propyl]pyrrolidin-2-one hydrochloride

Amine Used: 1-(3-aminopropyl)-2-pyrrolidone

Yield: 0.025 g (67% of theory)

Mass Spectrum MH⁺ 263(100)

g2. 2-(4-amino-2-methylphenyl)aminomethyl-1,4-diaminobenzene hydrochloride and 2-(4-amino-3-methylphenyl)aminomethyl-1,4-diaminobenzene hydrochloride

Amines Used: 4-tert.-butyloxycarbonylamino-3-methylaniline and 4 tert.-butyloxycarbonylamino-2-methylaniline

Yield: 0.021 g (27% of theory)

Mass Spectrum MH⁺ 243(100)

h2. 2-[5-amino-2-(2,5-diaminobenzylamino)phenyl]ethanol hydrochloride and 2-[2-amino-5-(2,5-diaminobenzylamino)phenyl]ethanol hydrochloride

Amines Used: 4-tert.-butyloxycarbonylamino-3-(2-hydroxyethyl)aniline and 4 tert.-butyloxycarbonylamino-2-(2-hydroxyethyl)aniline

Yield: 0.025 g (30% of theory)

Mass Spectrum MH⁺ 273(100)

i2. 2-(3-aminophenyl)aminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: 3-tert.-butyloxycarbonylaminoaniline

Yield: 0.025 g (67% of theory)

Mass Spectrum MH⁺ 229(100)

j2. 4-[2-(2,5-diaminobenzylamino)ethyl]benzene sulfonamide hydrochloride

Amine Used: 4-(2-aminoethyl)benzene sulfonamide

Yield: 0.025 g (58% of theory)

Mass Spectrum MH⁺ 321(100)

k2. 2-[4-amino-2-(2 5-diaminobenzylamino)phenoxy]ethanol hydrochloride

Amine Used: 4-tert.-butyloxycarbonylamino-2-amino-(2-hydroxy)ethoxybenzene

Yield: 0.025 g (58% of theory)

Mass Spectrum MH⁺ 289(100)

l2. 2-[(2,5-diaminobenzyl)-(2-hydroxyethyl)amino]ethanol hydrochloride

Amine Used: diethanolamine

Yield: 0.0259 (75% of theory)

Mass Spectrum MH⁺ 226(100)

m2. [1-(2,5-diaminobenzyl)pyrrolidin-2-yl]methanol hydrochloride

Amine Used: prolinol

Yield: 0.025 g (76% of theory)

Mass Spectrum MH⁺ 222(100)

n2. 1-(2,5-diaminobenzyl)pyrrolidin-3-ol hydrochloride

Amine Used: 3-hydroxypyrrolidine

Yield: 0.025 g (79% of theory)

Mass Spectrum MH⁺ 208(100)

o2. 1-(2,5-diaminobenzyl)pyrrolidin-2-carboxamide hydrochloride

Amine Used: prolinamide

Yield: 0.025 g (73% of theory)

Mass Spectrum MH⁺ 235(100)

p2. 1-(2,5-diaminobenzyl)piperdin-3-ol hydrochloride

Amine Used: 3-hydroxypiperidine

Yield: 0.025 g (76% of theory)

Mass Spectrum MH⁺ 222(100)

q2. 2-(2,5-diaminobenzylamino)propan-1,3-diol hydrochloride

Amine Used: 3-amino-12-propandiol

Yield: 0.015 g (47% of theory)

Mass Spectrum MH⁺ 212(100)

r2. 2-(2,5-diaminobenzylamino)-3-hydroxypropionamide hydrochloride

Amine Used: 3-hydroxy-2-aminopropionamide

Yield: 0.025 g (75% of theory)

Mass Spectrum MH⁺ 225(100)

s2. 2-(2,5-diaminobenzylamino)-succinic acid hydrochloride

Amine Used: aspargine

Yield: 0.037 g (102% of theory)

Mass Spectrum MH⁺ 253 (100)

t2. 2-cyclopropylaminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: cyclopropylamine

Yield: 0.025 g (87% of theory)

Mass Spectrum MH⁺ 178(100)

u2. 2-(2 5-diaminobenzylamino)ethanol hydrochloride

Amine Used: ethanolamine

Yield: 0.025 g (86% of theory)

Mass Spectrum MH⁺ 182(100)

v2. (2,5-diaminobenzylamino)acetic acid hydrochloride

Amine Used: glycine

Yield: 0.025 g (82% of theory)

w2. 4-(2,5-diaminobenzylamino)phenol hydrochloride

Amine Used: 4-aminophenol

Yield: 0.025 g (75% of theory)

Mass Spectrum MH⁺ 230(100)

x2. 2-(benzo[1,3]dioxol-5-ylaminomethyl)-1,4-diaminobenzene hydrochloride

Amine Used: 3,4-methylenedioxyaniline

Yield: 0.025 g (68% of theory)

Mass Spectrum MH⁺ 258(100)

y2. [(2,5-diaminobenzyl)methylamino)acetonitrile hydrochloride

Amine Used: methylaminoacetonitrile

Yield: 0.025 g (83% of theory)

Mass Spectrum MH⁺ 191 (100)

z2. 2-pentylaminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: pentylamine

Yield: 0.025 g (79% of theory)

Mass Spectrum MH⁺ 208(100)

a3. 2-[(3-dimethylaminopropylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 3-dimethylaminopropylamine

Yield: 0.025 g (68% of theory)

Mass Spectrum MH⁺ 223(100)

b3. 2-[2-(5-nitropyridin-2-ylamino)ethylaminolmethyl]-1,4-diaminobenzene hydrochloride

Amine Used: 2-amino-5-nitropyridine

Yield: 0.025 g (56% of theory)

Mass Spectrum MH⁺ 303(100)

c3. 2-[(2-aminoethylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: ethylenediamine

Yield: 0.025 g (77% of theory)

Mass Spectrum MH⁺ 181(100)

d3. 3-[2-(2,5-diaminobenzylamino)-1-hydroxyethyl]phenol hydrochloride

Amine Used: 1-(3-hydroxyphenyl)-2-aminoethanol

Yield: 0.025 g (65% of theory)

Mass Spectrum MH⁺ 274(100)

e3. 2-[(4-methylpyridin-2-ylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 2-picolylamine

Yield: 0.022 g (65% of theory)

Mass Spectrum MH⁺ 229(100)

f3. 2-(2,5-diaminobenzyl)-1-methyl-1,2,3,4-tetrahydroisoguinoline-6,7-diol hydrochloride

Amine Used: 1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline

Yield: 0.015 g (37% of theory)

Mass Spectrum MH⁺ 300(100)

g3. 2-(2,5-diaminobenzylamino)-4-methylsulfanylbutyric acid hydrochloride

Amine Used: 2-amino-4-methylmercaptobutyric acid

Yield: 0.015 g (32% of theory)

h3. 1-(2,5-diaminobenzyl)pyrrolidine-2-carboxylic acid hydrochloride

Amine Used: pyrrolidin-2-carboxylic acid

Yield: 0.025 g (72% of theory)

Mass Spectrum MH⁺ 236(55)

i3. 2-phenylaminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: aniline

Yield: 0.025 g (77% of theory)

Mass Spectrum MH⁺ 214(100)

j3. 2-(4-dimethylaminophenyl)aminomethyl-1,4-diaminobenzene hydrochloride

Amine Used: 4-amino-N,N-dimethylaniline

Yield: 0.025 g (62% of theory)

Mass Spectrum MH⁺ 257(100)

k3. 1-[3-(2,5-diaminobenzylamino)phenyl]ethanol hydrochloride

Amine Used: 3-(1-hydroxyethyl)aniline

Yield: 0.025 g (68% of theory)

Mass spectrum MH⁺ 258(100)

l3. 2-[(3,4-dimethoxyphenylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 3,4-dimethoxyaniline

Yield: 0.025 g (65% of theory)

Mass Spectrum MH⁺ 274(100)

m3. 2-[(3-fluoro-2-methoxyphenylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 3-fluoro-2-methoxyaniline

Yield: 0.021 g (57% of theory)

Mass Spectrum MH⁺ 262(100)

n3. 4-chloro-2-(2,5-diaminobenzylamino)phenol hydrochloride

Amine Used: 4-chloro-2-aminophenol

Yield: 0.025 g (67% of theory)

Mass Spectrum MH⁺ 264(100)

o3. 2-[(4-trifluoromethylphenylamino)methyl]-1,4-diaminobenzene hydrochloride

Amine Used: 4-trifluoromethylaniline

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 282(100)

p3. 2-(p-tolylaminomethyl)-1,4-diaminobenzene hydrochloride

Amine Used: 4-methylaniline

Yield: 0.025 g (74% of theory)

Mass Spectrum MH⁺ 228(100)

Example 2 Synthesis of 2-(1-aminoethyl)-1,4-diaminobenzene Compounds

A. Synthesis of (4-tert.-butoxycarbonylamino-3-(1-hydroxyethyl)phenyl)carbamic acid tert.-butyl ester

3.3 g (0.01 mol) (4-tert.butoxycarbonylamino-3-bromophenyl)carbamic acid-tert.-butyl ester are dissolved in 200 ml diethyl ether under argon. Then first 20 ml of a 1.6 molar methyl lithium solution are added at −25° C. and then 16 ml of a 1.6 molar tert.-butyl lithium solution are added. After one hour 1.2 ml (0.02 mol) of acetaldehyde are added and the reaction mixture is slowly heated to 20° C. After halting the reaction the reaction mixture is hydrolyzed with water, the organic phase is extracted with dilute sodium hydroxide and then dried with magnesium sulfate. The solvent is distilled off in a rotary evaporator and the residue is purified with petroleum ether/acetic acid ethyl ester (8:2). 3.0 g (85% of theoretical) of (4-tert.-butoxycarbonylamino-3-(1-hydroxyethyl)phenyl)carbamic acid-tert.-butyl ester having a melting point of 189° C. are obtained.

B. Synthesis of (4-tert.-butoxycarbonylamino-3-( 1-aminoethyl)phenyl)carbamic acid tert.-butyl ester

3.5 g of the (4-tert.-butoxycarbonylamino-3-(1-hydroxyethyl)phenyl)carbamic acid-tert.-butyl ester (0.01 mol) from step A are dissolved in 30 ml of dichloromethane. Then 1.3 g (0.013 mol) triethylamine and 2.4 g (0.01 mol) mesitylene sulfochloride are added at 4° C. The solution is first stirred for an hour at 4° C. and subsequently stirred for one hour at room temperature. The solvent is distilled off in a rotary evaporator and the residue is purified on silica gel with hexane/ethyl acetate (1:5).

Subsequently the product is dissolved in 30 ml of dimethylsulfoxide and reacted with 3.5 g (0.05 mol) sodium azide and then the reaction mixture is heated to 60° C. After halting the reaction the reaction mixture is poured into ethyl acetate/water and the organic phase is dried with magnesium sulfate. The solvent is distilled off in a rotary evaporator and the residue is purified on silica gel with ethyl acetate/hexane (1:6).

The product obtained is dissolved in ethanol and hydrogenated at 25° C. under addition of 200 mg of a palladium-activated carbon catalyst (10%) and 1.8 g (0.03 mol) acetic acid. After four hours the catalyst is removed by filtration. The solvent is distilled off in a rotary evaporator and the residue is purified on silica gel with chloroform/methanol/triethylamine (50:1 0:1).

1.0 g (28% theoretical) of (4-tert.-butoxycarbonylamino-3-(1-aminoethyl)-phenyl)carbamic acid tert.-butyl ester with a melting point of 170° C. were obtained.

C. Synthesis of 1,4-diamino-2-(1-aminoethyl)benzene Compounds 0.033 g (0.0001 mol) (4-tert.-butoxycarbonylamino-3-(1-aminoethylphenyl)-carbamic acid-tert.-butyl ester from step B and 0.00015 mol of a suitable aldehyde are dissolved in 1,2-dichloroethane. Subsequently 0.1 ml of an acetic acid solution (1M in 1,2-dichloroethane) and 0.06 g (0.0003 mol) NaBH(OAc)₃ are added and the reaction mixture is stirred for 5 to 15 hours. After terminating the reaction the reaction mixture is poured into 10 ml acetic acid ethyl ester, the organic phase is extracted with sodium hydrogen carbonate and then dried with magnesium sulfate. The solvent is distilled off with a rotary evaporator and the residue is purified on silica gel with petroleum ether/ethyl acetate (9:1). The product thus obtained is heated in 4 ml of ethanol at 50° C.

Subsequently 1.5 ml of a 2.9 molar ethanolic hydrochloric acid solution is added dropwise to make the hydrochloride. The precipitate is filtered off, washed twice with 1 ml of ethanol and then dried.

a. 1,4-diamino-2-(1-butylaminoethyl)benzene hydrochloride

Aldehyde Derivative Used: butyraldehyde

Yield: 0.025 g (78% of theory)

Mass Spectrum MH⁺ 208(100)

b. 1,4-diamino-2-{1-(3-methylbutylamino)ethyl}benzene hydrochloride

Aldehyde Derivative Used: 3-methylbutryaldehyde

Yield: 0.025 g (75% of theory)

Mass Spectrum MH⁺ 222(100)

c. 1,4-diamino-2-(1-benzylaminoethyl)benzene hydrochloride

Aldehyde Derivative Used: benzaldehyde

Yield: 0.025 g (71% of theory)

Mass Spectrum MH⁺ 242(100)

d. 1,4-diamino-2-{1-[(Pyridin-2-ylmethyl)amino]ethyl}benzene hydrochloride

Aldehyde Derivative Used: pyridin-2-carbaldehyde

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 243(20)

e. 1,4-diamino-2-{1-[(pyridin-3-ylmethyl)amino]ethyl}benzene hydrochloride

Aldehyde Derivative Used: pyridin-3-carbaldehyde

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 243(50)

f. 1,4-diamino-2-{1-[(pyridin-4-ylmethyl)amino]ethyl}benzene hydrochloride

Aldehyde Derivative Used: pyridin-4-carbaldehyde

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 243(100)

g. 1,4-diamino-2{-1-[(thiophen-2-ylmethyl)amino]ethyl}benzene hydrochloride

Aldehyde Derivative Used: thiophen-2-carbaldehyde

Yield: 0.025 g (70% of theory)

Mass Spectrum MH⁺ 248(100)

h. 1,4-diamino-2-{1-[(thiophen-3-ylmethyl)amino]ethyl}benzene hydrochloride

Aldehyde Derivative Used: thiophen-3-carbaldehyde

Yield: 0.025 g (70% of theory)

Mass Spectrum MH⁺ 248(100)

i.1,4-diamino-2-{1-(cyclohexylmethylamino)ethyl}benzene hydrochloride

Aldehyde Derivative Used: cyclohexanecarbaldehyde

Yield: 0.025 g (70% of theory)

Mass Spectrum MH⁺ 248(100)

j. 4-{[1-(2,5-diaminophenyl)ethylamino]methyl}benzene hydrochloride

Aldehyde Derivative Used: 4-hydroxybenzaldehyde

Yield: 0.025 g (68% of theory)

Mass Spectrum MH⁺ 258(100)

k. 1,4-diamino-2-[1-(4-dimethylaminobenzylamino)ethyl]benzerie hydrochloride

Aldehyde Derivative Used: 4-dimethylaminobenzaldehyde

Yield: 0.020 g (46% of theory)

Mass Spectrum MH⁺ 285(100)

l. 1,4-diamino-2-(1-(4-nitrobenzylamino)ethyl]benzene hydrochloride

Aldehyde Derivative Used: 4-nitrobenzaldehyde

Yield: 0.025 g (63% of theory)

Mass Spectrum MH⁺ 286(100)

m. 2-{[1-(2,5-diaminophenyl)ethylamino]methyl}4-nitrophenol hydrochloride

Aldehyde Derivative Used: 2-hydroxy-5-nitrobenzaldehyde

Yield: 0.025 g (60% of theory)

Mass Spectrum MH⁺ 303(100)

n. 1,4-diamino-2-{1-(4-pyrrolidin-1-ylbenzylamino)ethyl}benzene hydrochloride

Aldehyde Derivative Used: 4-pyrrolidinobenzaldehyde

Yield: 0.025 g (54% of theory)

Mass Spectrum MH⁺ 311(100)

p. 1,4-diamino-2-{1-[(benzo[1,3]dioxol-5-ylmethyl)amino[ethyl}benzene hydrochloride

Aldehyde Derivative Used: 3,4-methylendioxybenzaldehyde

Yield: 0.025 g (63% of theory)

Mass Spectrum MH⁺ 286(100)

q. 1,4-diamino-2-{1-(3-chlorobenzylamino)ethyl}benzene hydrochloride

Aldehyde Derivative Used: 3-chlorobenzaldehyde

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 276(100)

D. Synthesis of 1,4-diamino-2-(1-aminoethyl)benzene Compounds

0.033 g (0.0001 mol) (4-tert-butoxycarbonylamino-3-(1-aminoethyl)-phenyl)carbamic acid-tert.-butyl ester from step B are dissolved in 25 ml ethanol. Subsequently 0.00015 mol of a suitable fluoro derivative are added. After termination of the reaction the reaction mixture is poured into water, the aqueous phase is extracted with ethyl acetate and then dried with magnesium sulfate. The solvent is distilled off in a rotary evaporator and the residue is purified on silica gel with hexane/ethyl acetate (5:1). The product thus obtained is heated in 4 ml of ethanol at 50° C. Subsequently 1.5 ml of a 2.9 molar ethanolic hydrochloric acid solution were added dropwise. The precipitate was filtered off, washed twice with 1 ml of ethanol and then dried.

r. 1,4-diamino-2-[1-(2-nitrophenylamino)ethyl]benzene hydrochloride

Fluoride Derivative Used: 1-fluoro-2-nitrobenzene

Yield: 0.025 g (65% of theory)

Mass Spectrum MH⁺ 273(100)

s. 1,4-diamino-2-[1-(4-fluoro-2-nitrophenylamino)ethyl]benzene hydrochloride

Fluoride Derivative Used: 1,4-difluoro-3-nitrobenzene

Yield: 0.020 g (50% of theory)

Mass Spectrum MH⁺ 291 (100)

t. 1,4-diamino-2-[1-(5-fluoro-2-nitrophenylamino)ethyl]benzene hydrochloride

Fluoride Derivative Used: 1,5-difluoro-2-nitrobenzene

Yield: 0.025 g (62% of theory)

u. 1,4-diamino-2-[1-(2-fluoro-6-nitrophenylamino)ethyl]benzene hydrochloride

Fluoride Derivative Used: 1,2-difluoro-6-nitrobenzene

Yield: 0.025 g (62% of theory)

Mass Spectrum MH⁺ 291(100)

v. 2-[1-(2,5-diaminophenyl)ethylamino]-5-nitrobenzoic acid hydrochloride

Fluoride Derivative Used: 2-fluoro-5-nitrobenzoic acid

Yield: 0.025 g (64% of theory)

Mass Spectrum MH⁺ 317(100)

w. 1,4-diamino-2-[1-(4-bromo-2-nitrophenylamino)ethyl]benzene hydrochloride

Fluoride Derivative Used: 1-bromo4-fluoro-3-nitrobenzene

Yield: 0.01 8 g (39% of theory)

x. 1,4-diamino-2-[1-(4-amino-2-nitrophenylamino)ethyl]benzene hydrochloride

Fluoride Derivative Used: 1-fluoro-2-nitro-4-aminobenzene

Yield: 0.016 g (36% of theory)

Mass Spectrum MH⁺ 288(80)

Examples 3 to 70 Oxidation Hair Dye Precursor Compositions

Hair dye precursor solutions with the following compositions were prepared:

0.0125 mmol developer substance of formula (I) according to Table I 0.0125 mmol coupler substance according to Table I 0.01 g potassium oleate (8 percent aqueous solution) 0.01 g ammonia (22 percent aqueous solution) 0.01 g ethanol 0.003 g ascorbic acid to 1.0 g water

1 g of the above-described dye precursor solution is mixed with 1 g of a 6 percent aqueous hydrogen peroxide solution immediately prior to application. Subsequently the mixture is applied to bleached hair. After an acting time of 30 minutes at 40° C. the hair is rinsed with water, washed with a commercially obtained shampoo and dried. The resulting dyed hair colors are tabulated in Table I.

TABLE I DYED HAIR COLORS OBTAINED WITH THE OXIDATION DYE PRECURSOR COMPOSITIONS ACCORDING TO THE INVENTION Developer 1,3-diamino-4-(2- 5-amino- Of 1,3-di-hydroxy- hydroxyethoxy)- 2-methyl Formula I benzene benzene sulfate phenol 1-naphthol Example From Ex.1 coupler coupler coupler coupler 3 a1 Bright light Gray-blue Medium Gray-rose Blond Purple 4 b1 Bright light Blue Bright Bright Blond Purple Gray-rose 5 c1 Bright light Gray-blue Bright Gray-rose Blond Purple 6 d1 Bright blond Blue Medium Bright Purple Purple 7 e1 Bright light Gray-blue Bright Gray-rose Blond Purple 8 f1 Bright blond Blue Medium Violet Purple 9 g1 Bright light Blue Medium Gray-rose Blond Purple 10 h1 Bright light Blue Medium Gray-rose Blond Purple 11 i1 Bright blond Blue Medium Violet Purple 12 j1 Bright blond Blue Bright Gray-rose Purple 13 k1 Bright Blond Blue Medium Gray-rose Purple 14 l1 Bright light Blue Bright Gray-rose Blond Purple 15 m1 Bright light Blue Bright Bright Blond Purple Purple 16 n1 Bright light Blue Bright Gray-rose Blond Purple 17 o1 Bright Blond Blue Medium Bright Purple Gray-rose 18 p1 Bright light Blue Bright Gray-rose Blond Purple 19 q1 Bright light Blue Bright Gray-rose Blond Purple 20 r1 Blue Deep blue Blue Deep blue 21 s1 Red-brown Gray-blue Gray-rose Gray-rose 22 t1 Bright rose Bright Bright Gray-rose Blue-gray Rose 23 u1 Bright light Bright Gray-blue Bright Bright Blond Purple Gray-rose 24 v1 Bright light Blue Bright Gray-rose Blond Purple 25 w1 Bright light Blue Bright Gray-rose Blond Purple 26 x1 Bright ash Blue Medium Violet Blond Purple 27 y1 Bright Blond Blue Medium Violet Purple 28 z1 Bright light Gray-blue Bright Gray-rose Blond Purple 29 a2 Gold blond Gray Medium Medium Purple Purple 30 b2 Bright light Blue Bright Gray-rose Blond Purple 31 c2 Bright blond Blue Medium Gray-rose Purple 32 d2 Medium purple Blue Medium Violet Purple 33 e2 Bright light Blue Medium Medium Blond Purple Purple 34 f2 Bright light Blue Bright Gray-rose Blond Purple 35 g2 Violet Deep blue Violet Blue 36 h2 Violet Deep blue Violet Violet 37 i2 Deep blue Deep blue Gray-rose Gray-blue 38 j2 Bright light Gray-blue Medium Gray-rose Blond Purple 39 k2 Gray-blue Gray-blue Gray-blue Gray-blue 40 l2 Bright Blond Blue Medium Gray-rose Purple 41 m2 Bright blond Blue Medium Gray-rose Purple 42 n2 Bright blond Blue Medium Bright Purple Gray-rose 43 o2 Bright Blond Blue Medium Gray-rose Purple 44 p2 Bright Blond Blue Medium Gray-rose Purple 45 q2 Bright light Blue Medium Bright Blond Purple Gray-rose 46 r2 Bright blond Deep blue Purple Violet 47 s2 Bright light Bright Bright Bright Blond Gray-blue Purple Rose 48 t2 Bright light Blue Medium Gray-rose Blond Purple 49 u2 Bright light Gray-blue Medium Gray-rose Blond Purple 50 v2 Bright light Gray-blue Bright Gray-rose Blond Purple 51 w2 Bright Purple Bright gray Bright Bright Purple Purple 52 x2 Bright ash Gray-blue Not available Gray-rose Blond 53 y2 Bright light Gray-blue Bright Bright Blond Purple Gray-rose 54 z2 Bright light Gray-blue Bright Gray-rose Blond Purple 55 a3 Bright light Blue Bright Bright Blond Purple Purple 56 b3 Bright light Gray-blue Bright Gray-rose Blond Purple 57 c3 Bright light Gray-blue Purple Gray-rose Blond 58 d3 Bright light Gray-blue Medium Gray-rose Blond Purple 59 e3 Bright Blond Deep blue Medium Violet Purple 60 f3 Bright light Bright Bright Gray-rose Blond Gray-blue Purple 61 g3 Bright light Bright Bright Bright Blond Gray-blue Rose Gray-rose 62 h3 Bright light Gray-rose Bright Bright Blond Purple Gray-rose 63 i3 Bright Blond Deep blue Medium Violet Purple 64 j3 Bright ash Gray-blue Purple Gray-rose Blond 65 k3 Bright ash Blue Medium Violet Blond Purple 66 l3 Gray Blue Violet Gray-rose 67 m3 Bright Blond Blue Medium Violet Purple 68 n3 Bright Blond Gray-blue Gray Gray-rose Purple 69 o3 Bright Blond Blue Medium Bright Purple Violet 70 p3 Bright Blond Blue Medium Violet Purple

Examples 71 to 80 Oxidation Hair Dye Precursor Compositions

Hair dye precursor solutions with the following compositions were prepared:

X g developer substances E1 to E1″ of formula (I) according to Table II U g developer substances E2 to E9 according to Table II Y g coupler substances K11 to K36 according to Table IV Z g direct-dyeing dye compounds D1 to D3 according to Table III 10.000 g potassium oleate (8 percent aqueous solution) 10.000 g ammonia (22 percent aqueous solution) 10.000 g ethanol 0.300 g ascorbic acid to 100.000 g water

30 g of the above-described dye precursor solution are mixed with 30 g of a 6 percent aqueous hydrogen peroxide solution immediately prior to application. Subsequently the mixture is applied to hair. After an acting time of 30 minutes at 40° C. the hair is rinsed with water, washed with a commercially obtained shampoo and dried. The resulting dyed hair colors are given in Table V.

Examples 81 to 86 Oxidation Hair Dye Precursor Compositions

Hair dye precursor creams with the following compositions were prepared:

X g developer substances E1 to E1″ of formula (I) according to Table II Y g coupler substances K11 to K36 according to Table IV Z g direct-dyeing dye compound D2 according to Table III 15.0 g cetyl alcohol 0.3 g ascorbic acid 3.5 g sodium lauryl alcohol diglycol ether sulfate, 28% aqueous solution 3.0 g ammonia, 22% aqueous solution 0.3 g sodium sulfite, water-free to 100 g water

30 g of the above-described dye precursor cream are mixed with 30 g of a 6 percent aqueous hydrogen peroxide solution immediately prior to application. Subsequently the mixture is applied to hair. After an acting time of 30 minutes the hair is rinsed with water, washed with a commercially obtained shampoo and dried. The resulting dyed hair colors are given in Tables VI.

Examples 87 to 110 Oxidation Hair Dye Precursor Compositions

Hair dye precursor solutions with the following compositions were prepared:

0.0125 mmol developer substance of formula (I) according to Table VII 0.0125 mmol coupler substance according to Table VII 0.01 g potassium oleate (8 percent aqueous solution) 0.01 g ammonia (22 percent aqueous solution) 0.01 g ethanol 0.003 g ascorbic acid to 1.0 g water

1 g of the above-described dye precursor solution is mixed with 1 g of a 6 percent aqueous hydrogen peroxide solution immediately prior to application. Subsequently the mixture is applied to bleached hair. After an acting time of 30 minutes at 40° C. the hair is rinsed with water, washed with a commercially obtained shampoo and dried. The resulting dyed hair colors are tabulated in Table VII.

TABLE II DEVELOPER SUBSTANCES E1 2-phenylaminomethyl-1,4-diaminobenzene hydrochloride (according to example 1, i3) E1′ 2-[(4-methylpyridin-2-ylamino)methyl]-1,4-diaminobenzene hydrochloride (according to example 1, e3) E1″ 2-[(2,5-diaminobenzyl)-(2-hydroxyethyl)amino]ethanol hydrochloride (according to example 1, l2) E2 1,4-diaminobenzene E3 2,5-diaminophenylethanol sulfate E4 3-methyl-4-aminophenol E5 4-amino-2-aminomethylphenol dihydrochloride E6 4-aminophenol E7 N,N-bis(2′-hydroxyethyl)-p-phenylenediamine sulfate E8 4,5-diamino-1-(2′-hydroxyethyl)pyrazole sulfate E9 2,5-diaminotoluene sulfate

TABLE III DIRECT-DYEING DYE COMPOUNDS D1 2,6-diamino-3-((pyridin-3-yl)azo)pyridine D2 6-chloro-2-ethylamino-4-nitrophenol D3 2-amino-6-chloro-4-nitrophenol

TABLE IV DEVELOPER SUBSTANCES K11 1,3-diaminobenzene K12 2-amino-4-(2′-hydroxyethyl)aminoanisole sulfate K13 1,3-diamino-4-(2′-hydroxyethoxy)benzene sulfate K14 2,4-diamino-5-fluorotoluene sulfate K15 3-amino-2-methylamino-methoxypyridine K16 3,5-diamino-2,6-dimethoxypyridine dihydrochloride K17 2,4-diamino-5-ethoxytoluene sulfate K18 N-(3-dimethylamino)phenylurea K19 1,3-bis-(2,4-diaminophenoxy)propane tetrahydrochloride K21 3-aminophenol K22 5-amino-2-methylphenol K23 3-amino-2-chloro-6-methylphenol K24 5-amino-4-fluoro-2-methylphenol sulfate K25 1-naphthol K26 1-acetoxy-2-methylnaphthalene K31 1,3-dihydroxybenzene K32 2-methyl-1,3-dihydroxybenzene k33 1-chloro-2,4-dihydroxybenzene K34 4-(2′-hydroxyethyl)amino-1,2-methylenedioxybenzene Hydrochloride K35 3,4-methylenedioxyphenol K36 2-amino-5-methylphenol

TABLE V HAIR DYE PRECURSOR COMPOSITIONS AND DYED HAIR COLORS OBTAINED THEREWITH Exemplary Dyestuff* 71 72 73 74 E1 0.35 0.30 E1′ 0.30 E1″ 0.30 E4 0.30 E5 0.30 E6 0.30 E8 0.30 K31 0.18 0.20 K32 0.22 K33 0.20 K25 0.30 0.30 0.30 K26 0.35 Dyed Hair Red-brown Red-brown Red-brown Red-brown Color *amounts of dyestuffs are in grams

TABLE V (CON): HAIR DYE PRECURSOR COMPOSITIONS AND DYED HAIR COLORS OBTAINED THEREWITH Exemplary Dyestuff* 75 76 77 78 79 80 E1 0.50 0.16 E1′ 0.40 0.15 E1″ 0.40 0.15 E2 0.15 E3 0.15 E9 0.15 K12 0.10 K13 0.09 0.09 K31 0.20 0.15 0.20 0.10 K32 0.20 0.10 0.10 K33 0.20 K21 0.05 K22 0.05 K23 0.05 0.10 0.10 0.10 Dyed Hair Blond Blond Blond Blond Blond Blond Color *amounts of dyestuffs are in grams

TABLE VI HAIR DYE PRECURSOR COMPOSITIONS AND DYED HAIR COLORS OBTAINED THEREWITH Exemplary Dyestuff* 81 82 83 84 85 86 E1 2.50 0.90 E1′ 2.50 0.90 E1″ 2.50 0.90 K12 0.10 0.10 0.10 K13 1.10 1.10 1.10 K31 1.10 1.10 1.10 0.40 0.40 0.40 D2 0.10 0.10 0.10 K23 0.05 0.10 0.10 0.10 Dyed Hair Black Black Black Brown Brown Brown Colors *amounts of dyestuffs are in grams

TABLE VII DYED HAIR COLORS OBTAINED WITH THE OXIDATION DYE PRECURSOR COMPOSITIONS ACCORDING TO THE INVENTION Developer 1,3-diamino-4-(2- 5-amino- Of 1,3-dihydroxy- hydroxyethoxy)- 2-methyl Formula I benzene benzene sulfate phenol 1-naphthol Example From Ex.2 coupler coupler coupler coupler 87 a Bright light Gray-blue Purple Gray-rose Blond 88 b Bright light Blue Bright Gray-rose Blond Purple 89 c Bright light Gray-blue Purple Gray-rose Blond 90 d Bright blond Blue Medium Violet Purple 91 e Bright light Gray-blue Bright Gray-rose Blond Purple 92 f Bright blond Blue Medium Gray- Purple Violet 93 g Bright light Gray-blue Bright Gray-rose Blond Purple 94 h Bright Blond Gray-blue Purple Violet 95 i Bright blond Gray-blue Bright Purple Bright Violet 96 j Bright blond Blue Medium Gray-rose Purple 97 k Bright light Blue Bright Gray-rose Blond Purple 98 l Bright Blond Blue Purple Violet 99 m Yellow Brown Red-brown Red-brown 100 n Bright light Gray Bright Bright Blond Purple Violet 101 o Bright Blond Blue Medium Bright Purple Gray-rose 102 p Bright light Gray-blue Bright Bright Blond Purple Violet 103 q Bright light Gray-blue Bright Bright Blond Purple Violet 104 r Bright blond Gray Red wine Gray-black 105 s Green Blue-black Red wine Gray 106 t Bright blond Gray-blue Bright Gray Purple 107 u Bright light Gray-blue Medium Bright Blond Purple Gray-rose 108 v Bright light Gray-blue Red-brown Gray Blond 109 W Bright light Gray-blue Medium Gray Blond Purple 110 X Bright Purple Bluish red Medium Violet Purple

Unless otherwise indicated all percentages are percentages by weight.

The disclosure in German Patent Application 199 61 272.2 of Dec. 18, 1999 is incorporated here by reference. This German Patent Application describes the invention described hereinabove and claimed in the claims appended hereinbelow and provides the basis for a claim of priority for the instant invention under 35 U.S.C. 119.

While the invention has been illustrated and described as embodied in substituted 2-aminoalkyl-1,4-diaminobenzene compounds and dye compositions containing same, it is not intended to be limited to the details shown, since various modifications and changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.

What is claimed is new and is set forth in the following appended claims. 

We claim:
 1. An oxidation dye precursor composition for oxidative dyeing of keratin fibers, said dye precursor composition comprising at least one developer compound and at least one coupler compound; wherein said at least one coupler compound is selected from the group consisting of 2,6-diaminopyridine, 2-amino-4-[(2-hydroxyethyl)amino]anisole, 2,4-diamino-1-fluoro-5-methylbenzene, 2,4-diamino-1-methoxy-5-methylbenzene, 2,4-diamino-1-ethoxy-5-methylbenzene, 2,4-diamino-1-(2-hydroxyethoxy)-5-methylbenzene, 2,4-di[(2-hydroxyethyl)-amino]-1,5-dimethoxybenzene, 2,3-diamino-6-methoxypyridine, 3-amino-6-methoxy-2-(methylamino)pyridine, 2,6-diamino-3,5-dimethoxypyridine, 3,5-diamino-2,6-dimethoxypyridine, 1,3-diaminobenzene, 2,4-diamino-1-(2-hydroxyethoxy)benzene, 2,4-diamino-1,5-di(2-hydroxyethoxy)-benzene, 1-(2-aminoethoxy)-2,4-diaminobenzene, 2-amino-1-(2-hydroxyethoxy)-4-methyl-aminobenzene, 2,4-diaminophenoxyacetic acid, 3-[(di(2-hydroxyethyl)-amino]-aniline, 4-amino-2-di[(2-hydroxyethyl)amino]-1-ethoxybenzene, 5-methyl-2-(1-methylethyl)phenol, 3-[(2-hydroxyethyl)amino]-aniline, 3-[(2-amino-ethyl)-amino]aniline, 1,3-di(2,4-diaminophenoxy)propane, di(2,4-diaminophenoxy)-methane, 1,3-diamino-2,4-dimethoxy-benzene, 2,6-bis(2-hydroxyethyl)amino-toluene, 4-hydroxyindole, 3-dimethylaminophenol, 3-diethylaminophenol, 5-amino-2-methylphenol, 5-amino-4-fluoro-2-methylphenol, 5-amino-4-methoxy-2-methylphenol, 5-amino-4-ethoxy-2-methylphenol, 3-amino-2,4-dicholorophenol, 5-amino-2,4-dichlorophenol, 3-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 3-aminophenol, 2-{(3-hydroxyphenyl)-amino}acetamide, 5-[(2-hydroxyethyl)amino]-2-methylphenol, 3-[(2-hydroxyethyl)-aminophenol, 3-[(2-methoxyethyl)amino]phenol, 5-amino-2-ethylphenol, 2-(4-amino-2-hydroxy-phenoxy)ethanol, 5-[(3-hydroxypropyl)amino]-2-methylphenol, 3-[(2,3-dihydroxy-propyl)amino]-2-methylphenol, 3-[(2-hydroxyethyl)-amino]-2-methylphenol, 2-amino-3-hydroxypyridine, 5-amino-4-chloro-2-methylphenol, 1-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 2-methyl-1-naphthol acetate, 1,3-dihydoxybenzene, 1-chloro-2,4-dihydroxybenzene, 2-chloro-1,3-dihydroxybenzene, 1,2-dichloro-3,5-dihydroxy-4-methylbenzene, 1,5-dichloro-2,4-dihydroxy-benzene, 1,3-dihydroxy-2-methylbenzene, 3,4-methylenedioxyphenol, 3,4-methylenedioxyaniline, 5-[(2-hydroxyethyl)amino]-1,3-benzodioxole, 6-bromo-1-hydroxy-3,4-methylenedioxybenzene, 3,4-diaminobenzoic acid, 3,4-dihydro-6-hydroxy-1,4(2H)-benzoxazine, 6-amino-3,4-dihydro-1,4(2H)-benzoxazine, 3-methyl-1-phenyl-5-pyrazolone, 5,6-dihydroxyindole, 5,6-dihydroxyindoline, 5-hydroxyindole, 6-hydroxyindole, 7-hydroxyindole and 2,3-indolindione; and wherein said at least one developer compound includes at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound of the formula (I):

wherein R1, R2, R3 and R4, independently of each other, are each hydrogen, a C₁- to C₆-alkyl group, a C₁- to C₄-hydroxyalkyl group, a C₂- to C₄-dihydroxyalkyl group or a C₁- to C₄-alkoxy-(C₁- to C₂-)alkyl group, or R1 and R2 together with N form a four member to eight member aliphatic ring; wherein at least two of said R1, R2, R3 and R4 represent hydrogen and wherein R3 and R4 are not both simultaneously a C₁- to C₆-alkyl group; R5 represents hydrogen, a halogen atom, a C₁- to C₄-alkyl group, a C₁- to C₄-hydroxyalkyl group or a C₁- to C₄-alkoxy group; R6 and R7, independently of each other, each represent hydrogen, a C₁- to C₂-alkoxy group, a C₁- to C₆-alkyl group, a C₁- to C₆-alkenyl group, a C₁- to C₄-hydroxyalkyl group, a C₃- to C₄-dihydroxyalkyl group, a C₁- to C₄-aminoalkyl group, a C₁- to C₄-dimethylaminoalkyl group, a C₁- to C₄-acetylaminoalkyl group, a C₁- to C₄-methoxyalkyl group, a C₁- to C₄-ethoxyalkyl group, a C₁- to C₄-cyanoalkyl group, a C₁- to C₄-carboxyalkyl group, a C₁- to C₄-aminocarbonylalkyl group, a pyridylmethyl group, a furfuryl group, a hydrogenated furfuryl group, a substituted pyridyl group, a group of the formula II:

a group of the formula III:

a group of the formula IV:

wherein at least one of R6 and R7 is not hydrogen or R6 and R7 together with N form one of the following rings:

R8 represents hydrogen or a C₁- to C₆-alkyl group; R9 represents hydrogen, a carboxy group or an aminocarbonyl group; R10 and R11, independently of each other, each represent hydrogen, a hydroxy group, an aminocarbonyl group, a methylthiomethyl group, a substituted phenyl group having a phenyl group substituent or a hydroxy group substitutent or a group of the formula:

wherein R12, R13, R14, R15 and R16 are each, independently of each other, hydrogen, a halogen atom, a cyano group, a hydroxy group, a C₁- to C₄-alkoxy group, a C₁- to C₄-hydroxyalkoxy group, a C₁- to C₆-alkyl group, a C₁- to C₄-alkylthioether group, a mercapto group, a nitro group, an amino group, an alkylamino group, a hydroxyalkylamino group, a dialkylamino group, a di(hydroxyalkyl)amino group, a (dihydroxyalkyl)amino group, a (hydroxyalkyl)-alkylamino group, a trifluoromethane group, a —C(O)H group, a —C(O)CH₃ group, a —C(O)CF₃ group, a —Si(CH₃)₃ group, a C₁- to C₄-hydroxyalkyl group, a C₃- to C₄-dihydoxyalkyl group, or two of the groups R12 to R16 next to each other form an —O—CH₂—O— bridge; R17 represents a C₁- to C₄-alkyl group or a C₁- to C₄-hydroxyalkyl group; R18 represents hydrogen or a C₁- to C₆-alkyl group; R19 represents one or more hydrogen, hydroxy, carboxy, aminocarbonyl or hydroxymethyl group or groups; and R20 represents hydrogen or a C₁- to C₆-alkyl group, with the proviso that R1, R2 and R8 are not each hydrogen when (i) R5 is in the 5-position of the aromatic ring and R5 is hydrogen, a C₁- to C₄-alkyl group or a halogen atom, and when (ii) R6 and R7, independently of each other, are a C₁- to C₄-alkyl group or a phenyl group; or a physiologically compatible, water-soluble salt of said at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound of the formula (I).
 2. The oxidation dye precursor composition as defined in claim 1, wherein said at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound of the formula (I) is selected from the group consisting of 2-(2,3-dihydroxypropyl)-aminomethyl-1,4-diamino-benzene; 2-[(2-aminoethylamino)methyl]-1,4-diaminobenzene; 2-[(2-hydroxy-ethylamino)methyl]-1,4-diaminobenzene; 2-[(2,5-diaminobenzyl)methylamino]-ethanol; 2-(2,5-diaminobenzylamino)-propan-1-ol; 2-[(2,5-diaminobenzyl)-(2-hydroxyethyl)amino]ethanol; [1-(2,5-diaminobenzyl)-pyrrolidin-2-yl]methanol; 1-(2,5-diaminobenzyl)-pyrrolidin-2-carboxamide; 2-[(4-methylpyridin-2-yl-amino)-methyl]-1,4-diaminobenzene; 2-((2-aminophenylamino)methyl)-1,4-diamino-benzene; 2-((2-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((2-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-fluoro-phenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyethylaminophenyl-amino)methyl)-1,4-diaminobenzene; 2-((2-N,N-bis-(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-pyrrolidinphenylamino)methyl)-1,4-diaminobenzene; 2-((3-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((3-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-N,N-bis-(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-pyrrolidin-phenylamino)methyl)-1,4-diaminobenzene; 2-((4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-chlorophenylamino)methyl)-1,4-diaminobenzene; 2-((4-dimethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-fluorophenylamino)methyl)-1,4-diaminobenzene; 2-((4-hydroxyethylaminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-N,N-bis-(hydroxyethyl)aminophenylamino)methyl)-1,4-diaminobenzene; 2-((4-pyrrolidinphenylamino)methyl)-1,4-diaminobenzene; 2-((2-(2-hydroxy)-ethoxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-amino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-chloro-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyethylamino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((2-methyl-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-(2-hydroxy)-ethoxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-amino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-chloro-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxy-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyethylamino-4-aminophenylamino)methyl)-1,4-diaminobenzene; 2-((3-methyl-4-aminophenylamino)-methyl)-1,4-diaminobenzene; 2-((2-(2-hydroxy)ethoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((2-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-((3-(2-hydroxy)ethoxyphenylamino)methyl)-1,4-diaminobenzene; 2-((3-hydroxyphenylamino)-methyl)-1,4-diaminobenzene; 2-((4-(2-hydroxy)-ethoxy-phenylamino)methyl)-1,4-diaminobenzene; 2-((4-hydroxyphenylamino)methyl)-1,4-diaminobenzene; 2-(phenylamino)methyl-1,4-diaminobenzene; 2-[5-amino-4-(2,5-diaminophenylamino)-pyrazol-1-yl]ethanol; N²-(5-amino-1-methyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene; N²-(5-amino-1-isopropyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene and N²-(5-amino-1,3-dimethyl-1H-pyrazol-4-yl)-1,2,4-triaminobenzene.
 3. The oxidation dye precursor composition as defined in claim 1, containing from 0.005 to 20.0 percent by weight of said at least one substituted 2-aminoalkyl-1,4-diaminobenzene compound of the formula (I).
 4. The oxidation dye precursor composition as defined in claim 1, containing at least one direct-dyeing dye compound.
 5. The oxidation dye precursor composition as defined in claim 1, wherein said at least one developer compound includes at least one member selected from the group consisting of 1,4-diaminobenzene, 2,5-diaminotoluene, 2,5-diaminophenylethyl alcohol, 4-aminophenol, derivatives of said 4-aminophenol, derivatives of 4,5-diaminopyrazole and tetraaminopyrimidine compounds.
 6. The oxidation dye precursor composition as defined in claim 5, containing from 0.005 to 20 percent by weight of said at least one developer compound, based on a total amount of said dye precursor composition.
 7. The oxidation dye precursor composition as defined in claim 1, containing from 0.0005 to 20 percent by weight of at least one coupler compound, based on a total amount of said dye precursor composition.
 8. The oxidation dye precursor composition as defined in claim 4, wherein said at least one direct-dyeing dye compound is selected from the group consisting of triphenylmethane direct-dyeing dye compounds, aromatic nitro direct-dyeing dye compounds, direct-dyeing azo dye compounds and direct-dyeing anthraquinone dye compounds.
 9. The oxidation dye precursor composition as defined in claim 1, in the form of a solution, cream, emulsion or gel, and further comprising at least one cosmetic additive ingredient selected from the group consisting of solvents, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, thickeners and care materials.
 10. The oxidation dye precursor composition as defined in claim 1, wherein the keratin fibers to be dyed are hair. 